Jump to content
SAU Community

Recommended Posts

Car is sorted, faulty CAS.... 385rwkw @ 22 dropping to 18psi.... very conservative tune due to the previous issues... should swing 400rwkw without a sweat.

To those who questioned pinging trust me i can pick it up well in advance i have over $2500 in knock monitoring gear (PLEX which is the best on the market and another which was originally designed for RBs during the gibson era)

Its a truly weird occurrence and is only the second RB in 10yrs i've had with this issue (different symptoms though).

  • Like 1

Ill copy paste from my build thread

So yeah. Still Internal gate standard manifold position:

Update:

Car issue all sorted

Ended up being a faulty CAS

22 psi down to 18 psi, conservative tune to make sure it is all ok.

Then will be coming back with 2-3 degrees more timing (~20rwkw) and up to 6 psi boost

Top line no airbox

2nd line airbox restriction

1622751_804351736245854_1333795786_n.jpg

Nice. thats a very high number for a bolton turbo setup. Dyno sheet?

Borrow a standard 600x300 core from someone and hook it up outside of the car. Yep just literally hang it out the bonnet with some long ass pipes.

I'll give you my EFT details when you're ready.

Lol

Car is sorted, faulty CAS.... 385rwkw @ 22 dropping to 18psi.... very conservative tune due to the previous issues... should swing 400rwkw without a sweat.

To those who questioned pinging trust me i can pick it up well in advance i have over $2500 in knock monitoring gear (PLEX which is the best on the market and another which was originally designed for RBs during the gibson era)

Its a truly weird occurrence and is only the second RB in 10yrs i've had with this issue (different symptoms though).

Wow - an actual faulty CAS, good to know this can happen - have had discussions about the possibility of this kind of thing when working through a similar issue and was told by people that this would never happen due to a CAS specific problem, at least without huge rpm being involved. I had picked up the tuning of a while ago, it would take SFA timing without pinging (exactly the same symptoms as this one it seems) its head off - in this particular instance it was actually a seriously buggered cam belt which had enough slop at mid rpm to cause the CAS to throw out erratic triggering signals. Just replacing the cambelt etc (left the original CAS) allowed a further 5+deg of timing to be put into it and the owner was beside himself at the final result.

I "only" use a G4 KnockBlock - but even with that I can tell dodgy combustion in cars which the owners are adamant the existing tune is fine, even when it has apparently been tuned with det cans of some sort - I sometimes wonder how much it is the user and how much it is the hardware where people aren't noticing knock. I won't personally won't tolerate the little static noise you can get before you even hear rattling.

Thanks for sharing the positive outcome, definitely duly noted

Also great to see a high nistune result.

580rwkw is my record but im sure there are higher ones out there.... even a 460rwkw Nistune SR has come through with flying colors.

Was that 580kw with an AFM ( I would presume so as I don't think you can have a MAP sensor with NIStune?) if so which one?

I'm assuming it would just be a standard sensor in a different diameter pipe recalibrated?

Was that 580kw with an AFM ( I would presume so as I don't think you can have a MAP sensor with NIStune?) if so which one?

I'm assuming it would just be a standard sensor in a different diameter pipe recalibrated?

Was that 580kw with an AFM ( I would presume so as I don't think you can have a MAP sensor with NIStune?) if so which one?

I'm assuming it would just be a standard sensor in a different diameter pipe recalibrated?

few tricks like

Lol

Wow - an actual faulty CAS, good to know this can happen - have had discussions about the possibility of this kind of thing when working through a similar issue and was told by people that this would never happen due to a CAS specific problem, at least without huge rpm being involved. I had picked up the tuning of a while ago, it would take SFA timing without pinging (exactly the same symptoms as this one it seems) its head off - in this particular instance it was actually a seriously buggered cam belt which had enough slop at mid rpm to cause the CAS to throw out erratic triggering signals. Just replacing the cambelt etc (left the original CAS) allowed a further 5+deg of timing to be put into it and the owner was beside himself at the final result.

I "only" use a G4 KnockBlock - but even with that I can tell dodgy combustion in cars which the owners are adamant the existing tune is fine, even when it has apparently been tuned with det cans of some sort - I sometimes wonder how much it is the user and how much it is the hardware where people aren't noticing knock. I won't personally won't tolerate the little static noise you can get before you even hear rattling.

Thanks for sharing the positive outcome, definitely duly noted

Worst part is the ignition trace is not scattered like you would assume. ( not sure why the above is not in qoute tags lol)

100kw from a CAS replacement is a great result. I wonder how common this issue is...

I had the same issue in 2010, it was a bastard to diagnose. Basically boosting up but then breaking down in the upper RPM range, exactly the same as with OP, although on a stock car.

Good to hear it's sorted - very tidy power figure too btw!

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • Yeah I suspect even if you hold airmass per cycle/cylinder constant if you get too far away from stock you're still going to have problems running the factory tune within the bounds of the factory load scale. Cams, different displacement/rod ratio, etc. I'm just lucky that the GTIII-SS with wastegate boost + CA compliance cats is pretty much equivalent to stock turbos. When I have actual space I can finally get it tuned and modify the fuel system for flex fuel to 100% handle any detonation concerns when cranking the boost to whatever those dinky turbos can put out.
    • I would say no, why, because my daughter, who also lives in Goulburn, hasn't recommended us going there Pity, as we miss all the German joints around in Sydney, actually, the restaurants are the only thing I really miss about Sydney, and a special mention to Ishibanboshi at Bondi Junction, their Kara-age Don is heart cloggingly deliciousness (always added a special boiled egg...or 2) 😋 
    • Does that German restaurant still exist in the old place out the NW end of Goulburn? When I say "out the NW end of"...I am really being vague. It was 1997 when I was last there, and the only point of reference I can recall is that it was on the opposite side of the main drag from the big merino. And when I say "opposite side of the main drag", I don't mean "on the main drag". It was either a couple of streets back from there, or might have even been out in the sticks a bit further. Was an old farm building or mill or somesuch. And when I say "the big merino" I might actually be thinking of a completely different part of town, because I just looked on maps and the big bugger is not where I remembered him to be! The food was good, consisting largely of various German mystery-meat sausage/loaf things and kartofflen.
    • So while the second sentence is completely correct and the whole point of the conversation, the first sentence bears consideration. If this bloke is just hoping to throw big turbos on and drive it around, because there are no helpful facilities at all in his tropical paradise** then he likely has zero chance of even knowing what the TP is on the last column in the stock maps, let alone know whether the ECU is operating anywhere near it or past it. So the point is very very moot. And, per what I said before, at stock boost on those turbos, you may well be off the end of the map. **I'm just back from Vanuatu, so I know exactly what small Pacific nations can be like wrt paradise without requisite facilities. But it's not even that simple. I put a high flow on my car and had to drive it around without a proper tune because of the lack of opportunity*** to put the bigger AFM and injectors into it to allow it to be tuned. I had to turn the boost down to less than I had before, and back off the boost controller's ramp, because it was exploring parts of the map that it didn't drive in before, and really couldn't access for tuning on the dyno either, and so was pinging. It was still well within the last column, because when I first**** set up the Nistune on the Neo I rescaled all axes of the maps to give some more space to explore. ***Family dyno was broken ****This was 13 years ago, and the TIM thing wasn't a thing then and so TP would definitely grow when pushing past the stock tune's limits.
    • Yep, this bit another local owner. I caught it before putting the transmission back into the car, what I noticed was the pressure plate fingers weren't flat and even. It's more obvious with the pull style clutch because the throwout bearing ring was visibly not flat once everything is put together. Nismo should really update their instructions to call out this specific detail. I'm not even sure the clutch as-shipped orients everything properly.
×
×
  • Create New...